[Distutils] Setuptools: build_requires?

So I am curious, why doesn't setuptools provide a build_requires directive similar to install_requires, but for python setup.py build? Right now a particular Python module will fail if you import said dependency somewhere in your code. Centralizing such a dependency in setup.py seems, to me, very logical. So what gives? -- Jeroen Ruigrok van der Werven <asmodai(-at-)in-nomine.org> / asmodai イェルーン ラウフロック ヴァン デル ウェルヴェン http://www.in-nomine.org/ | http://www.rangaku.org/ | GPG: 2EAC625B Courage is not the absence of fear, but rather the judgment that something else is more important than fear.